Figure 1
(a) Schematic of a double-sided line-doubled Fresnel zone plate. The HSQ template structures are indicated in light grey and the Ir deposited on top is marked in dark grey. Adapted from Mohacsi et al. (2015). (b) Sketch of a Fresnel zone plate. (c)–(f) Different ways of overlaying two zone plates such as the one in (b), illustrating various types of moiré fringes. |